Honda Prelude Forum
 
Go Back   Honda Prelude Forum > Tech-Talk > 5th Gen Honda Prelude

Thread Title
FI Build Help

 
Reply
 
LinkBack Thread Tools Display Modes
  #1 (permalink)  
Old 07-31-2014, 04:43 PM
I'm New
 
Join Date: Jul 2014
Posts: 2
iTrader: (0)
B3ardrift is on a distinguished road
FI Build Help

I am building my prelude engine after blowing the motor. I will be using Mahle GoldSeries Pistons as they are drop in and dont require resleeving.

What compression ratio would be best for turbo? 10-2-1, 8-9-1 or 11-5-1?
How much boost can these engines handle?
Should I get: Flat top, High Comp or inverted dome on the piston?

What rods should I go with? Anything Cheaper then eagle rods? Im only looking to get 250-300 HP.

I will be tuning with honda s300


THANK YOU! :D







Also, I am located in Eastern Tennessee and am I need of a quality machine shop to machine my block.Does anyone recommend anyone nearby? Either in NC,VA,or TN. I do not want to ship the block.
Reply With Quote
  #2 (permalink)  
Old 08-01-2014, 01:14 AM
dbd6604's Avatar
I wish I was Kat Dennings' bra

 
Join Date: Jul 2008
Location: Quad-Cities, IL
Posts: 5,979
iTrader: (17)
dbd6604 has a reputation beyond reputedbd6604 has a reputation beyond reputedbd6604 has a reputation beyond reputedbd6604 has a reputation beyond reputedbd6604 has a reputation beyond reputedbd6604 has a reputation beyond reputedbd6604 has a reputation beyond reputedbd6604 has a reputation beyond reputedbd6604 has a reputation beyond reputedbd6604 has a reputation beyond reputedbd6604 has a reputation beyond repute
Re: FI Build Help

Quote:
What compression ratio would be best for turbo? 10-2-1, 8-9-1 or 11-5-1?
8.9:1

"How much boost" depends on the snail you plan on using.


Quote:
Should I get: Flat top, High Comp or inverted dome on the piston?
Obviously not high comp.

Quote:
What rods should I go with? Anything Cheaper then eagle rods? Im only looking to get 250-300 HP.
I know people that successfully run OEM rods and make 275+ WHP, but...it probably wouldn't hurt to look into this a little more. I'm definitely not an expert on F/I, maybe someone else can chime in. Either way, you need to do a LOT more research before you start spending any money. Start here: So, you wanna go turbo, huh?
__________________
Prelude Enthusiast: [prel-yood, preyl-, prey-lood, pree-lood], [en-thoo-zee-ast, -ist] noun: Someone who is willing to do whatever it takes to push the envelope, performance wise or stylistically, all the while brushing their shoulders off in a truly pimp-esque manor.

See also: Automotive Pioneer
Reply With Quote
  #3 (permalink)  
Old 08-01-2014, 10:28 AM
I'm New
 
Join Date: Jul 2014
Posts: 2
iTrader: (0)
B3ardrift is on a distinguished road
Re: FI Build Help

Thank You! Ive read that the h22a4 walls are very thin, how much boost would be a safe amount. I was thinking of doing only about 10lbs but if I can safely run anything higher that will be great. I will also be using a supertech block guard if that makes a difference.
Reply With Quote
  #4 (permalink)  
Old 08-01-2014, 01:35 PM
98vtec's Avatar
H23 VTEC'd
ROTM!
 
Join Date: Jun 2006
Posts: 1,476
iTrader: (0)
98vtec has a reputation beyond repute98vtec has a reputation beyond repute98vtec has a reputation beyond repute98vtec has a reputation beyond repute98vtec has a reputation beyond repute98vtec has a reputation beyond repute98vtec has a reputation beyond repute98vtec has a reputation beyond repute98vtec has a reputation beyond repute98vtec has a reputation beyond repute98vtec has a reputation beyond repute
Send a message via AIM to 98vtec
Re: FI Build Help

Quote:
Originally Posted by B3ardrift View Post
Thank You! Ive read that the h22a4 walls are very thin, how much boost would be a safe amount. I was thinking of doing only about 10lbs but if I can safely run anything higher that will be great. I will also be using a supertech block guard if that makes a difference.
Psi doesn't mean anything without knowing the turbo setup and other parts involved.

Mahle pistons are not drop in. They require a very specific process with a specific stone during honing while using a machine that not many machine shops own.

Cylinder wall strength is the least of your worries at only 250-300hp and I wouldn't run a block guard to save my life.

What is your turbo setup? The parts you use in your setup can have a very drastic effect on how easily it makes power, how hard the engine has to work to make said power as well as on longevity of the engine in general. An engine that has to work hard to make power even with a turbo added leads to a short life. Second, the proper tune is important but it's the overall dynamics of your setup which allow the tune to be that much better and make your experience that much more enjoyable.
Reply With Quote
  #5 (permalink)  
Old 08-02-2014, 12:30 PM
5ThGeaRedLined's Avatar
Bronze Member
 
Join Date: Jul 2013
Location: Long Island, N.Y.
Posts: 166
iTrader: (0)
5ThGeaRedLined is on a distinguished road
Re: FI Build Help

I've seen 8 to 9 psi ran safely on a h22a4 with stock compression. You roughly get almost 275hp possibly 3 with a great tune with some other goodies. Since our engines are high compression u can turn the boost to a lower level and get wat hp ur looking for. deff get a kz manual tensioner and balance shaft removal kit, please lol. either way with ur engine somewhat built id go 10 psi maybe 11. if it was me id leave the compression alone at 10:1 I think wat the h22a4 is. If u lower the compression your gonna have to up the psi up a lil more to achieve ur hp goal. I love boosted cars, wish I boosted my lude but it being a sh and high milage I'm good lol, good luck on the build, hope this helps
__________________
SH BB6 99
Reply With Quote
  #6 (permalink)  
Old 08-02-2014, 03:48 PM
98vtec's Avatar
H23 VTEC'd
ROTM!
 
Join Date: Jun 2006
Posts: 1,476
iTrader: (0)
98vtec has a reputation beyond repute98vtec has a reputation beyond repute98vtec has a reputation beyond repute98vtec has a reputation beyond repute98vtec has a reputation beyond repute98vtec has a reputation beyond repute98vtec has a reputation beyond repute98vtec has a reputation beyond repute98vtec has a reputation beyond repute98vtec has a reputation beyond repute98vtec has a reputation beyond repute
Send a message via AIM to 98vtec
Re: FI Build Help

Quote:
Originally Posted by 5ThGeaRedLined View Post
I've seen 8 to 9 psi ran safely on a h22a4 with stock compression. You roughly get almost 275hp possibly 3 with a great tune with some other goodies. Since our engines are high compression u can turn the boost to a lower level and get wat hp ur looking for. deff get a kz manual tensioner and balance shaft removal kit, please lol. either way with ur engine somewhat built id go 10 psi maybe 11. if it was me id leave the compression alone at 10:1 I think wat the h22a4 is. If u lower the compression your gonna have to up the psi up a lil more to achieve ur hp goal. I love boosted cars, wish I boosted my lude but it being a sh and high milage I'm good lol, good luck on the build, hope this helps
With this being said, where are you coming up with these numbers and how are you determining Xpsi = ~Xwhp?

The amount of boost to give Xwhp can be approximated but only when you know what turbo and the amount of air it can flow. Also, coupled with knowing what other bolt ons can make a significant difference in the amount of power a turbo engine makes. A simple switch from a log manifold to a well designed tubular manifold can easily yield another 30-40whp without changing any boost level.

My point is there is a lot more information required for you to make an educated guess on the amount of power and engine can make per psi of boost.

The whole 8-9psi statements, that stock engines can apparently only hold, you see all over the internet are very false as it matters which turbo is pushing that amount of boost and how well the turbo setup works together to accomplish the goal of making power.

A 50mm turbo at 9psi is going to make a significantly less amount of power than say a 62mm turbo at the same pressure. So only saying that you can run 8-9psi plays no role and doesn't really help anyone. Pressure is not what kills engines, horsepower and RPM do. Pressure is only created when there is a differential between the intake and the exhaust. The engine can only ingest so much of the air that is pressurizing the intake manifold due to the valves closing. So in a way, when the valve shuts, that's like you putting all your weight against a wall then the door opens and the pressure is released (you fall through the door). I am explaining it this way in an attempt to help you understand that "pressure" is not created in the engine. this is not what kills engines. engines create torque/power which is effected by turbo pressure and the power created from the pressure is determined by the size and dimensions of the turbo. Pressure is only a fraction of the equation.

If you ever see people do cam swaps during dyno testing on a turbo car, you will often times see a drop in boost although the engine picks up significant power. intake and exhaust processing has been allowed to be more efficient (given a proper cam choice).

I like your thinking on keeping the compression at 10:1. Dropping the compression so low like some people do makes the engine a dog when not in boost and you have to raise the boost in order to create the same effect as the same setup with higher compression.

Last edited by 98vtec; 08-02-2014 at 03:54 PM.
Reply With Quote
Reply

Tags
h22 turbo boost honda car, turbo


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
which one head build or block build nightwing 5th Gen Honda Prelude 7 04-06-2014 03:10 PM
ENG: How to build a N/A H22 T.E.L. DIY Engine 145 01-03-2014 10:33 PM
H23 Build help LazyLude 4th Gen Honda Prelude 8 04-05-2012 08:47 PM
5th gen build Xris850 5th Gen Honda Prelude 0 03-29-2011 02:05 AM
B20a5 build..... please help, first build... 90_lude_s_27 3rd Gen Honda Prelude 8 11-22-2010 10:07 PM


All times are GMT -4. The time now is 07:56 AM.



Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
LinkBacks Enabled by vBSEO 3.6.0 PL2 © 2011, Crawlability, Inc.
vB.Sponsors


Copyright © 2006-2009 PreludeZone.com All Rights Reserved.